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Quarterback Alex Smith had to take a post-game X-ray on his right thumb, which he injured making a tackle on linebacker Ricky Brown. Smith didn’t know if the X-rays showed anything.

“I’m fine,” he said, “It’s not big deal.”

Of course that was the second hit Smith made; the first was his crushing block on Raiders’ defensive end Greg Ellis. Smith said after he flattened Ellis, he stood over him and glared. </p

>”He just smiled at me,” Smith said.

Thumb injury hopefully won’t hold Alex Smith back.

“I had to send a quick message,” Ellis said, meaning he had to let Smith know he wasn’t hurt. Ellis did say it was a good sign for the 49ers that they have a quarterback who can do those types of things.

Nate Davis said running the formations at the end of practice everyday helped him visualize the offensive sets. Davis, who has a learning disability, played without a glitch mentally while completing 6 of 11 passes for 67 yards, a touchdown and a two-point conversion. Davis said 1-yard touchdown pass to Dalanie Walker came off his second read.

The injuries don’t seem serious. Smith’s thumb didn’t look excessively swollen and he waited until after the game to get the X-ray. Adam Snyder left the locker room under his own power after spraining his right knee and ankle when he got rolled up. Snyder didn’t even look as if he was limping.

Safety Reggie Smith said he and fellow safety Curtis Taylor lined up wrong on the Raiders’ 2-point conversion. Smith blitzed from the right side and applied pressure to quarterback Charlie Frye, which caused him to throw incomplete. Two games for Smith, two late 2-point conversion negations that preserved the win. Last week against Denver, he picked off a 2-point conversion attempt.

The 49ers rushed for an astounding 275 yards, including 97 yards on 14 carries by Michael Robinson. He was told by Mike Singletary that he would play both fullback and halfback this season. For that task, Robinson stayed at 223 pounds.

“I asked Singletary if I should gain any weight, and he said, he didn’t believe in that. Play at the weight you’re comfortable with.”